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I have a specific requirement for communication between iOS devices and third-party Bluetooth devices.

I have successfully established a connection with the device(MFI enabled device ) using EAAccessory Framework using the following code.

let accessory = EAAccessoryManager.shared().connectedAccessories.first!
 session = EASession(accessory: accessory, forProtocol: “protocol string”)
 session?.outputStream?.delegate = self
 session?.outputStream?.schedule(in: RunLoop.main, forMode: RunLoopMode.defaultRunLoopMode)
 session?.outputStream?.open()
 session?.inputStream?.delegate = self
 session?.inputStream?.schedule(in: RunLoop.main, forMode: RunLoopMode.defaultRunLoopMode)
 session?.inputStream?.open()
 if availableAccessories.count>0
 print("Detected Device")
 
 else
 print("Not detected")
 

Now we need to make the iOS device to the listerning state to read the transmitted data by health Bluetooth device.

How can we change the iOS device to the listening state? We used the following code.

func stream(_ aStream: Stream, handle eventCode: Stream.Event) 
 switch eventCode 
 case Stream.Event.hasBytesAvailable:
 let inStream = aStream as? InputStream
 _readData(aStream: inStream!) 
 var buffer = [UInt8](repeating: 0, count: 2048)
 var data = Data()
 while ((inStream?.hasBytesAvailable)!) 
 let bytesRead: Int = inStream!.read(&buffer, maxLength: buffer.count)
 if bytesRead >= 0 
 data.append(buffer, count: bytesRead)
 
 

 print("data.hexEncodedString()")
 print(data.hexEncodedString())

 case Stream.Event.hasSpaceAvailable:
 print("Send the next queued command")
 default:
 print("Default")
 
 



 var readData : NSMutableData!



public func _readData(aStream:InputStream) 
 print("Trying to read data")
 let INPUT_BUFFER_SIZE = 65536
 let buf = UnsafeMutablePointer<UInt8>.allocate(capacity: INPUT_BUFFER_SIZE)
 while(aStream.hasBytesAvailable) 
 let bytesRead = aStream.read(buf, maxLength: INPUT_BUFFER_SIZE)
 if readData == nil 
 readData = NSMutableData()
 
 readData.append(buf, length: bytesRead)
 
 if readData != nil 
 let data: NSData = readData
 let count = data.length / MemoryLayout.size(ofValue: UInt8())
 var array = [UInt8](repeating: 0, count: count)
 data.getBytes(&array, length:count * MemoryLayout<UInt8>.size)
 print("Data Received :: (readData)")
 let dataString = String(data: data as Data, encoding: .utf8)!
 print("Data Received dataString:: (dataString)")
 

I am getting the result as

"CALL 60:a3:7d:38:ff:b3 1234 RFCOMM"

So we are unable to read actual data from the device. Are we going in the right direction? Do require any other scenario or further steps to achieve this?